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Wikipedia's List of U.S. state abbreviations as of 2018-08-21, cleaned up a little, from https://en.wikipedia.org/wiki/List_of_U.S._state_abbreviations#Table. Lines 1-8 are description; line 9 is column headers.
Codes and abbreviations for U.S. states, territories, and other regions
ISO ISO 3166 codes (2-letter, 3-letter, and 3-digit codes from ISO 3166-1; 2+2-letter codes from ISO 3166-2)
ANSI 2-letter and 2-digit codes from the ANSI standard INCITS 38:2009
USPS 2-letter codes used by the United States Postal Service
USCG 2-letter codes used by the United States Coast Guard (red text shows differences between ANSI and USCG)
Abbreviations:
GPO Older variable-length official US Government Printing Office abbreviations
AP Abbreviations from the AP Stylebook (red text shows differences between GPO and AP)
Name status of region ISO ANSI-alphabetic ANSI-numeric USPS USCG GPO AP Other abbreviations
United States of America Federal state US USA 840 US 00 U.S. U.S. U.S.A.
Alabama State US-AL AL 1 AL AL Ala. Ala.
Alaska State US-AK AK 2 AK AK Alaska Alaska Alas.
Arizona State US-AZ AZ 4 AZ AZ Ariz. Ariz. Az.
Arkansas State US-AR AR 5 AR AR Ark. Ark.
California State US-CA CA 6 CA CF Calif. Calif. Ca., Cal.
Colorado State US-CO CO 8 CO CL Colo. Colo. Col.
Connecticut State US-CT CT 9 CT CT Conn. Conn. Ct.
Delaware State US-DE DE 10 DE DL Del. Del. De.
District of Columbia Federal district US-DC DC 11 DC DC D.C. D.C. Wash. D.C.
Florida State US-FL FL 12 FL FL Fla. Fla. Fl., Flor.
Georgia State US-GA GA 13 GA GA Ga. Ga. Geo.
Hawaii State US-HI HI 15 HI HA Hawaii Hawaii H.I.
Idaho State US-ID ID 16 ID ID Idaho Idaho Id., Ida.
Illinois State US-IL IL 17 IL IL Ill. Ill. Il., Ills., Ill's
Indiana State US-IN IN 18 IN IN Ind. Ind. In.
Iowa State US-IA IA 19 IA IA Iowa Iowa Ia., Ioa.
Kansas State US-KS KS 20 KS KA Kans. Kan. Ks., Ka.
Kentucky State (Commonwealth) US-KY KY 21 KY KY Ky. Ky. Ken., Kent.
Louisiana State US-LA LA 22 LA LA La. La.
Maine State US-ME ME 23 ME ME Maine Maine Me.
Maryland State US-MD MD 24 MD MD Md. Md.
Massachusetts State (Commonwealth) US-MA MA 25 MA MS Mass. Mass.
Michigan State US-MI MI 26 MI MC Mich. Mich.
Minnesota State US-MN MN 27 MN MN Minn. Minn. Mn.
Mississippi State US-MS MS 28 MS MI Miss. Miss.
Missouri State US-MO MO 29 MO MO Mo. Mo.
Montana State US-MT MT 30 MT MT Mont. Mont.
Nebraska State US-NE NE 31 NE NB Nebr. Neb.
Nevada State US-NV NV 32 NV NV Nev. Nev. Nv.
New Hampshire State US-NH NH 33 NH NH N.H. N.H.
New Jersey State US-NJ NJ 34 NJ NJ N.J. N.J. N.Jersey
New Mexico State US-NM NM 35 NM NM N. Mex. N.M. New M.
New York State US-NY NY 36 NY NY N.Y. N.Y. N. York
North Carolina State US-NC NC 37 NC NC N.C. N.C. N. Car.
North Dakota State US-ND ND 38 ND ND N. Dak. N.D. NoDak
Ohio State US-OH OH 39 OH OH Ohio Ohio O., Oh.
Oklahoma State US-OK OK 40 OK OK Okla. Okla. Ok.
Oregon State US-OR OR 41 OR OR Oreg. Ore. Or.
Pennsylvania State (Commonwealth) US-PA PA 42 PA PA Pa. Pa. Penn., Penna.
Rhode Island State US-RI RI 44 RI RI R.I. R.I. R.I. & P.P., R. Isl.
South Carolina State US-SC SC 45 SC SC S.C. S.C. S. Car.
South Dakota State US-SD SD 46 SD SD S. Dak. S.D. SoDak
Tennessee State US-TN TN 47 TN TN Tenn. Tenn.
Texas State US-TX TX 48 TX TX Tex. Texas Tx.
Utah State US-UT UT 49 UT UT Utah Utah Ut.
Vermont State US-VT VT 50 VT VT Vt. Vt.
Virginia State (Commonwealth) US-VA VA 51 VA VA Va. Va. Virg.
Washington State US-WA WA 53 WA WN Wash. Wash. Wa., Wn.
West Virginia State US-WV WV 54 WV WV W. Va. W.Va. W.V., W. Virg.
Wisconsin State US-WI WI 55 WI WS Wis. Wis. Wi., Wisc.
Wyoming State US-WY WY 56 WY WY Wyo. Wyo. Wy.
American Samoa Insular area (Territory) AS ASM 16 US-AS AS 60 AS AS A.S.
Guam Insular area (Territory) GU GUM 316 US-GU GU 66 GU GU Guam
Northern Mariana Islands Insular area (Commonwealth) MP MNP 580 US-MP MP 69 MP CM M.P. CNMI
Puerto Rico Insular area (Territory) PR PRI 630 US-PR PR 72 PR PR P.R.
U.S. Virgin Islands Insular area (Territory) VI VIR 850 US-VI VI 78 VI VI V.I. U.S.V.I.
U.S. Minor Outlying Islands Insular areas UM UMI 581 US-UM UM 74
Baker Island island UM-81 81 XB
Howland Island island UM-84 84 XH
Jarvis Island island UM-86 86 XQ
Johnston Atoll atoll UM-67 67 XU
Kingman Reef atoll UM-89 89 XM
Midway Islands atoll UM-71 71 QM
Navassa Island island UM-76 76 XV
Palmyra Atoll atoll UM-95 95 XL
Wake Island atoll UM-79 79 QW
Micronesia Freely associated state FM FSM 583 FM 64 FM
Marshall Islands Freely associated state MH MHL 584 MH 68 MH
Palau Freely associated state PW PLW 585 PW 70 PW
U.S. Armed Forces – Americas US military mail code AA
U.S. Armed Forces – Europe US military mail code AE
U.S. Armed Forces – Pacific US military mail code AP
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